VLF stands for Very Small Frequency and is the same know-how used in detectors created for cash, jewellery, and relics. VLF detectors broadcast at frequencies calculated in kilohertz starting from three kHz to 70 kHz. Allow me to share five main reasons why you could opt for a VLF above http://sarmacikrolewscy.phorum.pl/viewtopic.php?p=25417#25417